| US 7,432,320 B2 | ||
| Processing aid for vinyl chloride resin and vinyl chloride resin composition | ||
| Noriko Sakashita, Akashi (Japan); Yasuhiro Miki, Himeji (Japan); and Akira Takaki, Kobe (Japan) | ||
| Assigned to Kaneka Corporation, Osaka (Japan) | ||
| Filed on Dec. 10, 2003, as Appl. No. 10/730,887. | ||
| Prior Publication US 2004/0116580 A1, Jun. 17, 2004 | ||
| Int. Cl. C08F 265/06 (2006.01); C08F 2/16 (2006.01); C08L 27/06 (2006.01); C08L 51/00 (2006.01) | ||
| U.S. Cl. 524—458 [524/523; 524/527; 525/80; 525/85; 525/227; 525/239] | 4 Claims |
| 1. A processing aid for a vinyl chloride resin; the processing aid having a specific viscosity ηsp of 0.6-1.6, an average particle diameter of 1500-3000 Å and being obtained by polymerizing
1 to 50 parts by weight of a monomer mixture (B) comprising 0 to 49% by weight of methyl methacrylate,
51 to 100% by weight of at least one monomer selected from the group consisting of a methacrylate ester except methyl methacrylate
and an acrylate ester, and
0 to 20 % by weight of a vinyl monomer copolymerizable therewith,
in the presence of a latex of a (co)polymer having specific viscosity of at least ηsp 0.7, which is obtained by polymerizing in emulsion 99 to 50 parts by weight of a monomer mixture (A) comprising
51 to 100% by weight of methyl methacrylate,
0 to 49 % by weight of at least one monomer selected from the group consisting of a methacrylate ester except methyl methacrylate
and an acrylate ester, and
0 to 20 % by weight of a vinyl monomer copolymerizable therewith, the total amount of (A) and (B) being 100 parts by weight,
and the specific viscosities being measured at 30° C. using Ubbelohde's Viscometer on 0.1 g of polymer dissolved in 100 mL
chloroform.
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